Mr(CaNO3)2=(40+14+16*3)*2=204
Mr(NaHCO4)=23+1+12+16*4=100
Mr(AlOH3)=27+16+1*3=46
1) <span>CH3 - CH2 - NH2+HCI -> </span><span><span>[C2H5NH3]</span>Cl
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1)Cu(NO3)2 + 2HOH = 2HNO3 + Cu(OH)2
Cu2+ + 2NO3- + 2H+ + 2OH- = 2H+ + 2NO3- + Cu(OH)2
Cu2+ + 2OH- = Cu(OH)2
рН < 7 - среда кислая
2)KCL + HOH
pH = 7 - среда нейтральная
3)Na2S + 2HOH = 2NaOH + H2S
pH>7 - среда щелочная
2Na + S2- + 2H+ + 2OH = 2Na+ + 2OH + H2S
2H+ + S2- = H2S